Luo Lu, Zhou Ping, Tong Cheng-Li, Shi Hui, Wu Jin-Shui, Huang Tie-Ping
School of Environment and Municipal Engineering, Xi'an University of Architecture and Technology, Xi'an 710055, China.
Huan Jing Ke Xue. 2013 Feb;34(2):692-7.
Fourier transform infrared spectroscopy (FTIR) was applied to study the structure of soil organic matter (SOM) of paddy soils under long-term different fertilization treatments. The aim was to clarify the different distribution of SOM between different fertilization methods and between topsoil and subsoil, and to explore the stability mechanism of SOM under different fertilization treatments. The results showed that the content of topsoil organic carbon (SOC) was the highest under organic-inorganic fertilizations, with the increment of SOC by 18.5%, 12.9% and 18.4% under high organic manure (HOM), low organic manure (LOM) and straw returning (STW) respectively compared with no fertilization treatment (CK). The long-term fertilizations also changed the chemical structure of SOM. As compared with CK, different fertilization treatments increased the functional group absorbing intensity of chemical resistance compounds (aliphatic, aromaticity), carbohydrate and organo-silicon compounds, which was the most distinctive under treatments of HOM, LOM and STW. For example, the absorbing intensity of alkyl was 0.30, 0.25 and 0.29 under HOM, LOM and STW, respectively. These values were increased by 87% , 56% and 81% as compared with that under CK treatment. The functional group absorbing intensity of SOM in the topsoil was stronger than that in the subsoil, with the most distinctive difference under HOM, LOM and STW treatments. The present research indicated that the enhanced chemical resistance of functional group of SOM may contribute to the high contents of SOC in the paddy soils under long-term organic-inorganic fertilizations, which also suggested a chemical stabilization mechanism of SOM in the paddy soils.
采用傅里叶变换红外光谱（FTIR）研究长期不同施肥处理下水稻土土壤有机质（SOM）的结构。目的是阐明不同施肥方式之间以及表土和底土之间SOM的不同分布，并探讨不同施肥处理下SOM的稳定性机制。结果表明，有机无机肥配施下表土有机碳（SOC）含量最高，与不施肥处理（CK）相比，高量有机肥（HOM）、低量有机肥（LOM）和秸秆还田（STW）处理下SOC分别增加了18.5%、12.9%和18.4%。长期施肥也改变了SOM的化学结构。与CK相比，不同施肥处理增加了化学抗性化合物（脂肪族、芳香性）、碳水化合物和有机硅化合物的官能团吸收强度，在HOM、LOM和STW处理下最为明显。例如，HOM、LOM和STW处理下烷基的吸收强度分别为0.30、0.25和0.29。与CK处理相比，这些值分别增加了87%、56%和81%。表土中SOM的官能团吸收强度强于底土，在HOM、LOM和STW处理下差异最为明显。本研究表明，长期有机无机肥配施下水稻土中SOM官能团化学抗性增强可能有助于SOC含量升高，这也揭示了水稻土中SOM的一种化学稳定机制。
